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<p>This research aims to improve the strength and ductility of cementitious composite through reinforcing cement mortar with metakaolin (MK) and fibreglass fabric (GF), respectively. The experiments started with dispersion of MK in cement mortar (5 and 10 wt. %) followed by the embedding of three evenly distributed layers of unidirectional GF (GFu) and bidirectional GF (GFb) into the matrices. The morphology, dispersion of MK and GF distribution and cohesion of fabrics in the matrix was observed using SEM–EDX and optical microscope, and their flexural strength was measured according to EN 196-1 standard. Based on the flexural results, the pseudo-ductile behavior was estimated in terms of ductility index (DI) using energy criteria. Finally, the flexural experimental results and crack propagation were simulated using finite element method (FEM). The results showed that the introduction of 10&#xa0;wt.% of MK to mortar leads to a significant increasement in its strength (5027 kN) and deformation (0.49&#xa0;mm) with an estimated improvement of 115% and 133% compared to mortar. Whereas the strength of MK/mortar was decreased by embedding GFb and GFu to matrix by 7% and 11%, respectively. While the deformation was improved significantly in case of unidirectional by 53% (GFu) without too many changes in case of GFb. The DI model showed a significant improvement in ductility by including GF, especially in the case of GFu with an improvement of up to 36%. Finally, the FEM results showed a high performance to model and predicate the failure modes of all batches with matching &gt; 96%.</p>

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High-strength and ductile mortar reinforced with metakaolin particles and E-glass unidirectional and bidirectional fabrics: experimental and modelling

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Samy Yousef,
  • Regina Kalpokaitė-Dičkuvienė,
  • Sharath P.Subadra,
  • Stasė Irena Lukošiūtė

摘要

This research aims to improve the strength and ductility of cementitious composite through reinforcing cement mortar with metakaolin (MK) and fibreglass fabric (GF), respectively. The experiments started with dispersion of MK in cement mortar (5 and 10 wt. %) followed by the embedding of three evenly distributed layers of unidirectional GF (GFu) and bidirectional GF (GFb) into the matrices. The morphology, dispersion of MK and GF distribution and cohesion of fabrics in the matrix was observed using SEM–EDX and optical microscope, and their flexural strength was measured according to EN 196-1 standard. Based on the flexural results, the pseudo-ductile behavior was estimated in terms of ductility index (DI) using energy criteria. Finally, the flexural experimental results and crack propagation were simulated using finite element method (FEM). The results showed that the introduction of 10 wt.% of MK to mortar leads to a significant increasement in its strength (5027 kN) and deformation (0.49 mm) with an estimated improvement of 115% and 133% compared to mortar. Whereas the strength of MK/mortar was decreased by embedding GFb and GFu to matrix by 7% and 11%, respectively. While the deformation was improved significantly in case of unidirectional by 53% (GFu) without too many changes in case of GFb. The DI model showed a significant improvement in ductility by including GF, especially in the case of GFu with an improvement of up to 36%. Finally, the FEM results showed a high performance to model and predicate the failure modes of all batches with matching > 96%.